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          content="很多朋友对于牙体结构并不太了解，其实，牙体指的是牙齿本身。牙体包括牙釉质、牙本质、牙骨质和牙髓组织。下面就来给大家详细介绍一下牙体的结构！,有贝口腔网为用户提供专业的口腔资讯，口腔知识，口腔问题，口腔卫生等综合服务型网站">

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                            <a th:href="@{'/consult/solo/'+${article.aid}}" th:text="${article.a_title}">牙体包括哪些?快来了解牙体结构常识！</a>
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                            很多朋友对于牙体结构并不太了解，其实，牙体指的是牙齿本身。牙体包括牙釉质、牙本质、牙骨质和牙髓组织。下面就来给大家详细介绍一下牙体的结构！</p>
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                                (1)牙釉质：是覆盖在牙冠上的硬组织，是人体组织中最硬的，为乳白色或黄白色，有一定的透明度。牙釉质的分布在牙尖部和切缘最厚，接近牙颈部最薄。牙釉质中96%为无机物，其余为有机物和水。</p>
                            <p>(2)牙本质：是构成牙齿的主体成分。其色淡黄；硬度没有牙釉质高，含75%无机物，30%为有机物和水。它是由牙本质基质、牙本质小管和牙本质神经组成的。</p>
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                                (3)牙骨质：是覆盖在牙根表面的硬组织。其硬度与身体中其它骨组织一样，呈淡黄色，含65%无机物，23%有机物，2%水。牙骨质的分布在根尖部和根分叉部较厚，在牙颈部最薄。牙骨质具有再生长特性。</p>
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                                (4)牙髓：是位于牙髓腔和根管腔的疏松结缔组织。在疏松结缔组织内包含着动脉和静脉血管、淋巴管和神经纤维。牙槽动脉的细小分支从根尖孔进入牙髓，并营养牙髓组织，在牙本质层下形成毛细血管丛，经静脉出根尖孔。牙髓中的淋巴毛细管从靠近牙本质的牙髓表面开始，与牙髓和血管伴随，出根尖孔，并与牙龈、牙周膜的淋巴管丛吻合，最终汇入颌下及额下淋巴结。牙髓神经组织来自三叉神经的第二支(分布在上颌牙齿)和第三支(分布在下颌牙齿)，经根尖孔进入根管腔和牙髓腔。牙髓内的神经是一种脱髓鞘的游离的神经末梢，只能接受痛觉，不能定位。</p>
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